Formal:
* کجا هستید؟ (koja hastid?) - This is the most formal way to say it, used when addressing someone with respect, like an elder or someone in a position of authority.
Informal:
* کجایی؟ (kojayi?) - This is the most common way to say it in informal settings with friends and family.
* کجایید؟ (kojayid?) - This is used when addressing a group of people informally.
* کجایی؟ (kojayi?) - This is a casual way to say it, often used with close friends or family members.
Other options:
* هستی کجا؟ (hasti koja?) - This is a more colloquial way to say it, literally translating to "you are where?".
It's important to choose the appropriate form based on the context and your relationship with the person you're speaking to.